Carriage-escapement for type-writing machines.



PATENTED SEPT. 8

No. 738,365. v

G. W. SINGLETON. CARRIAGE ESGAPEMENT FOR TYPE WRITING MACHINES.

APPLICATION FILED AUG. 21. 1902.

N0 MODEL.

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1 lfo.738,365.

UNITED STATES Patented September 8, 1903.

PATENT OFFICE.

GEORGE V. SINGLETON, OF DES MOINES, IOWA, ASSIGNOR TO JEWETT TYPEWRITERCOMPANY, OF DES MOINES, IOWA, A CORPORATION on IOWA.

CARRIAGE-ESCAPEIVIENT FOR TYPE-WRITING MACHINES.

SPECIFICATION forming part of Letters Patent No. 738,365, datedSeptember 8, 1903. Application filed August 21, 1902. Serial No.120,512. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE W. SINGLETON, a citizen of the United Statesof America, and a resident of Des Moines, Polk county, Iowa, haveinvented a new and useful Carriage- Escapement for Type-WritingMachines, of which the following is a specification.

The object of this invention is to provide improved means forcontrolling, gaging, and determining the step-by-step movement of thecarriage across the frame of a type-writing machine.

Afurther object of this invention is to minimize or obviate friction inan escapement mechanism between the holding-detent and theescapement-wheel and between said wheel and the releasing or feedingdog.

My invention consists in the construction, arrangement, and combinationof elements hereinafter set forth, pointed out in my claims, andillustrated by the accompanying drawings, in which- Figure 1 is a rearelevation illustrating my improved escapement mechanism and portions ofthe carriage employed therewith. Fig. 2 is an edge elevation of theescapement mechanism shown in Fig. 1, the carriage-bars being shown incross-section. Fig. 3 is a vertical section and elevation on theindicated line 33 of Fig. 2. Fig. 4 is a vertical section on theindicated line 4 4 of Fig.1. Fig. 5 is a detail of the pinion on theescapementshaft which engages the feed-rack of the carriage. Fig. 6 is adetail section illustrating the pivot on which the holding detent ismounted.

In the construction of the devices as shown the numeral 10 designates abracket formed with screw-holes 11 and shaped and arranged to be mountedon and project upward from the central portion of the rear of astructural frame of a type-writing machine. The bracket 10 is formedwith a housing 12 or recessed portion above the frame of the machine,and a shaft-bearing 13 extends forwardly from the central portion ofsaid housing. A shaft 14 is mounted for rotation in the bearing 13 andprojects therefrom at each end. A pinion 15 is mounted on or fixed tothe forward end portion of the shaft 14 and normally engages thefeed-rack 16 of the carriage of a type-writing machine. The feed-rack 16is formed with its teeth straight on one face and inclined on the otheror hooked, as desired, and the pinion 15 has its teeth formed hooked inopposition to the teeth of the feed-rack in order that when the carriageis under astrain, as of a spring pulling in one direction, the strainwill not lift the feed-rack out of engagement with the pinion. Aratchet-wheel 17 is mounted rigidly or non-revolubly on the rear portionof the shaft 14 within the housing 12 and is arranged to rotate withsaid shaft. Asleeve 18 is mounted loosely on the rear end portion of theshaft 14 adjacent the ratchet-wheel 17, and an escapement-wheel 19,toothed on its periphery,is mounted loosely on said sleeve and also iscontained. within the housing 12. A screw 20 is mounted in the extremityof the shaft 14, and a washer '21 on said screw overlaps and retains theescapement-wheel 19. A pawl 22 is pivoted at one end on the inner faceof the escapementwheel 19 and engages at its other end with theratchet-wheel17 and serves as'a connection between said wheels, wherebyin the movement of the carriage to the right with the rack-bar 16 inengagement with the pinion 15 the sh'aft 14 and ratchet-wheel may rotatefreely without rotating the escapementwheel, but will be immovable inthe opposite direction independent of said escapementwheel. A spring 23is mounted on the escapement-wheel 19 and normally engages and pressesthe pawl 22 into engagement with the ratchet-wheel 17, yielding for thepassage of the ratchet-wheel beneath the pawl in one direction. A pin 24is mounted in the escapement-wheel and serves as a stop to limit thecentrifugal movement of the pawl 22 and spring 23. A screw 25 is mountedin and projects forward from the housing 12 above the bearing 13, and aroller 20 is mounted for revolution thereon and arranged to receive andsupport the rear bar 27 of the carriage in its travel across the frameof the machine. The pinion 15, the ratchet-wheel 17, and escapementwheel 19 preferably are formed with an equal number of teeth.

A recess 28 is formed in the rear face of the .sectin g said recess.

bracket 10 and housing 12, and a groove is formed in the rear face ofsaid bracket inter- A plate 29 is mounted in the groove and held by ascrew 30, seated in the bracket, and one end of said plate overlaps therecess 28. A pivot 31 is mounted transversely of the recess 28 and hasits end portions reduced in cross-section and pivoted or jou'rnaled inseats in the bracket and plate 29, respectively. A holding-detent 32 isof the form of a bell-crank lever fulcrumed at its angle, and one arm 32thereof extends approximately Vertically from the pivot 31 and engagesthe face of one or another of the teeth of the escapement-wheel 19. Theother arm 32 of' the holding-detent extends approximately horizontallybeneath the escapement-wheel and is held against further downwardmovement by a stud 33 thereon engaging the lower wall of the recess 28.The holding-detent 32 is held normally with its arm 32 in engagementwith the escapementtooth by the impingement of a spring-held pin 34against its outer edge. The pin 34 projects into the recess 28 from itsseat in a hole in the bracket 10, and the spring backing'said pin,dotted lines, Fig. 1, is confined in said hole and adjusted as totension by a screw 35, seated in said hole and adjustable therein. Theengagement of the arm 32 with a tooth of the escapement-wheel is slight,suflicient only to prevent rotation of said wheel and lock the carriageagainst movement in one direction, and such engagement is of the flatend of the arm contacting with an inclined face of the tooth, the angleof contact measured between the flat top of the arm and the contiguousside of the tooth of the escapement-wheel with which it is in contactbeing acute and readily released with a minimum of sliding friction.

A releasing and feeding dog or detent 36 is slidably mounted forvertical rectilinear reciprocation in a groove formed in the rear' faceof the bracket 10 and intersecting the cavity of the housing 12. Thereleasing and feeding dog or detent 36 is connected by a pitman 37 orother suitable means with the universal bar of the key mechanism of thetype-writing machine in such a manner that auyactuation of the universalbar (not shown) will lift the dog. A screw 38 is mounted adjustablylongitudinally of the dog 36, and the upper end thereof projects fromthe dog beneath the extremity of the horizontal arm 32 of the detent 32.The upper end of the dog 36 is apexed or beveled in opposite directions,and the shorter beveled face thereof constitutes the impact or engagingface of the dog with one or another of the teeth of the escapement-wheel19. The apexed upper end of the releasing and feeding dog 36 normallyrests at a point just outside the orbit of the extremities of the teethof the escapement-wheel, and the upper end of the screw 38 contacts withthe lower edge of the arm 32 of the detent 32. -An actuation of theuniversal bar of the machine lifts the detent or dog 36 into the orbitof the teeth of the escapement wheel 19 and causes the screw 38 to liftthe arm 32", rotate the detent 32, and move the arm 32 thereof away fromthe wheel and out of engagement with its.

tooth. 'lhereupon the escapement-wheel released from the detent 32 movesforwardly under the strain of the carriage-spring until a tooth engagesthe contact-face of the detent or dog 36. There is a clearance betweenthe impact-face of the dog 36 and the next tooth of the escapement-Wheelthat insures the forward movement of the wheel upon its release from thedetent-arm 32 and before its engagement with the dog 36; Upon therelaxation of the lifting force from the dog 36 said dog will descendfrom the escapement-wheel and out of contact with its tooth and permitthe reengagement of the detent-arm 32 with the next tooth under theinfluence of the spring-held pin 34. Upon the release of the dog 36 fromthe escapement-wheel the detent-arm 32 already has moved within theorbit of the teeth of said wheel and been positioned to receive the nexttooth thereof in the forward movement of the wheel.

I do not limit myself to the construction of mechanisms to which theescapementis applicable, as it may be applied to other andwidely-different devices, nor do I feel bound to follow the specificconstruction shown and described.

What I claim as my invention is 1. An escapenient for type writingmachines, comprising the escapement-shaft, the pinion thereon andarranged for engagement by the feed-rack of a carriage, theescapement-wheel connected with said shaft, a holding-detent normally inengagement with said escapement-wheel and the releasing and feed ingdetent arranged for the release of the holding-detent from the wheel andengagement with said wheel, which releasing and feeding detent isnon-rotatable and mounted for rectilinear reciprocation radially of saidescapement-wheel. I

2. In a device of the class described,the escapement-shaft, theescapement-wheel on said shaft, the pinion on said shaft and arrangedfor engagement by a carriage-spring drawn in one direction, a holdingdetent formed as a bell-crank lever fulcrumed at its angle and havingone arm normally extending into engagement with said escapementwheel andspring-held in such position and the other arm of said holding-detentextended laterally, a non-rotatable releasing and feeding detentnormally out of engagement with the escapement-wheel and arranged formovement rectilinearly into engagement with said wheel and means wherebyin the rectilinear movement of the releasing and feeding detent towardsaid wheel the holding-detentis engaged and released from saidescapement-wheel.

3. In a device of the class described, the

teases bracket formed with a housing, a bearing formed on and extendinglaterally from the central portion of said housing, the escapement-shaft mounted for rotation in said bearing, a pinion on said shaftand arranged for engagement by the feed-rack of a carriage, aratchet-Wheel mounted on said shaft within the housing, anescapement-wheel mounted loosely on said shaft within the housing, apawl on said escapement-wheel and engaging said ratchet-wheel, aholding-detent pivoted on said bracket and arranged for normalengagement with the escapement-vvheel, a nonrotatable releasing andfeeding detent mounted for rectilinear reciprocation-in said bracket andarranged to engage said escapementwheel at times, one arm of theholding-detent extending into the path of travel of and arranged to beengaged by the releasing and feeding detent only in the advance of thelatter toward the escapement-wheel and yield ing pressure devices actingupon the holdingdetent.

4. In a device of the class described, the bracket formed with ahousing, a bearing on said housing, a shaft mounted for rotation in thebearing and arranged for rotation by the feed-rack of the carriage, anescapementwheel loosely mounted on said shaft within the housing,paWl-and-ratchet connections between said escapement-wheel and shaft, aholding-detent of bell-crank form normally spring-held in engagementwith the escapement-wheel and independent of the feedingdetent, and areleasing and feeding detent mounted for rectilinear reciprocation inthe bracket and arranged for impact with and synchronous release of theholding-detent and engagement with the escapement-wheel.

5. In a device of the class described, the combination of theescapement-wheel, the holding-detent normally engaging said wheel, thefiat top of the vertical arm of the detent forming an acute angle withthe contiguous side of the tooth of the escapement-wheel with which itis in contact, the releasing and feeding detent arranged for rectilinearreciprocatiou across the path of one arm of the holding-detent andshaped for impact therewith, the inner end of the releasing and feedingdetent being non-rotatable and shaped forengagement with theescapement-Wheel on an obtuse angle.

6. In a device of the class described, an escapement-wheel, a releasingand feeding detent normally out of engagement with said wheel and out ofthe orbit of the teeth thereon a holding-detent of bell-crank formmounted independent of the feeding and releasing detent and having onearm normally springheld in engagement with the escapementwheel and theother arm arranged for impact by the releasing and feeding detent in themovement of the latter detent into the orbit of the teeth of theescapement-wheel to check rotation of said wheel antecedent to thereengagement of the wheel by the holding-detent.

7. In a device of the class described, the holding-detent, a pivottherefor formed with a hub, on which the detent is loosely mounted, andreduced end portions seated in supports, the escapement-wheel arrangedfor engagement by said detent and means for releasing said detent fromsaid wheel, said means comprising a releasing and feeding detent mountedfor intermittent engagement with the holding-detent.

8. In a device of the class described, the combination of theescapement-wheel, the holding-detent of bell-crank form spring-held withone arm normally in engagement with a tooth of said wheel and the otherarm extending laterally, a releasing and feeding detent mounted forrectilinear reciprocation and alternate engagement with anddisengagement from the escapement-wheel and an adjustable pin in saidreleasing and feeding detent and arranged for engagement with thelateral arm of the holding-detent, whereby in the forward movement ofthe releasing and feeding detent the holding-detent is oscillated out ofengagement with the escapement.

Signed by me,at Des Moines, Iowa, this 26th day of May, 1902.

GEORGE W. SINGLETON.

Witnesses:

GEO. A. J EVVETT, S. 0. SWEET.

